Pellets were prepared from a powder mixture of 80 mol. % of potassium niobate (KNbO3) and 20 mol. % of potassium magnesium fluoride (KMgF3). The pellets were sintered at 900 ° C for 15 h in gold sealed tubes. The structural transformations in the obtained oxyfluoride K(Nb0.8Mg0.2)O2.4F0.6 were checked by X-ray diffraction (XRD) from room temperature to 525 ° C. The phase transitions were investigated by dielectric measurements (DE), differential thermal analysis (DTA) and... Topics: Ceramic, K(Nb0.8Mg0.2)O2.4F0.6, Phase Transitions
Pellets were prepared from a powder mixture of 80 mol. % of potassium niobate (KNbO3) and 20 mol. % of potassium magnesium fluoride (KMgF3). The pellets were sintered at 900 ° C for 15 h in gold sealed tubes. The structural transformations in the obtained oxyfluoride K(Nb0.8Mg0.2)O2.4F0.6 were checked by X-ray diffraction (XRD) from room temperature to 525 ° C. The phase transitions were investigated by dielectric measurements (DE), differential thermal analysis (DTA) and differential... Topics: Ceramic, K(Nb0.8Mg0.2)O2.4F0.6, Phase Transitions
byInternational Journal of Engineering Research & Science (IJOER)
Abstract — Kinetic studies were conducted on the process of the dissolution of non-ferrous metals with the use of sulfur-containing material as a source of leaching agent - sodium thiosulfate. It is shown that with increasing concentrations of sodium hydroxide in solution in the range of 0.1 - 1.0 M, copper recovery is increased from 21.5 to 46.2 %. As the temperature increases from 25 to 45 0 C, copper dissolution rate in the initial moment of the time increases, then over time this... Topics: complex and low-grade raw materials, the structure of condensed systems, structural-phase...
In this section, we examine cycles that use two-phase media as the working fluid. These can be combined with gas turbine cycles to provide combined cycles which have higher efficiency than either alone. They can also be used by themselves to provide power sources for both terrestrial and space applications. The topics to be covered are: i) Behavior of two-phase systems: equilibrium, pressure temperature relations ii) Carnot cycles with two-phase media iii) Rankine cycles iv) Combined cycles Topics: Physics, Statistical Physics and Thermodynamics, Phase Transitions, Thermodynamics, Carnot Cycle,... Source: http://www.flooved.com/reader/3203
byJohn Hartley Clarke;Dr John H Clarke firstname.lastname@example.org
Crystal Structure and Phase Transitions of solid deuterium iodide Ph D thesis John H Clarke 1975 London University The crystal structure of solid deuterium iodide was studied by thermal neutron and X-ray diffraction at three temperatures. At 4.2K the low phase structure is ordered, monoclinic space group C2/c, with 16 molecules in the unit cell. At 84K a two-fold disordered orthorhombic structure, space group Bbcm, is proposed with four molecules in the unit cell, each deuterium atom... Topics: Structure of solid deuterium iodide, Hydrogen Iodide, Deuterium Iodide, J H Clarke, London...
byStrukov, Boris A., author; Levanyuk, Arkadi P., author; SpringerLink (Online service)
Ferroelectric Phenomena in Crystals: Physical Foundations Author: Professor Boris A. Strukov, Professor Arkadi P. Levanyuk Published by Springer Berlin Heidelberg ISBN: 978-3-642-64340-8 DOI: 10.1007/978-3-642-60293-1 Table of Contents: General Characteristics of Structural Phase Transitions in Crystals Phenomenological Theory of Second-Order Structural Transitions in Crystal Proper Ferroelectrics: Anomalies of Physical Properties in Phase Transitions Dielectric Anomalies in Structural... Topics: Materials, Materials science, Metallic Materials, Strongly Correlated Systems, Superconductivity,...
Mark W. Zemansky Heat and Thermodynamics ( 5th.ed.) McGraw-Hill Book Company Inc. 1968 Acrobat 7 Pdf 114 Mb. Scanned by artmisa using Canon DR2580C + flatbed option Topics: Physics, Temperature, PV, Work, First Law, Ideal Gases, Kinetic Theory, Second Law, Refrigerators,...
View the complete course: http://ocw.mit.edu/8-334S14 Instructor: Mehran Kardar Statistical Mechanics is a probabilistic approach to equilibrium properties of large numbers of degrees of freedom. This is the first semester of a two-semester sequence. The focus of this course is Statistical Physics of Fields. License: Creative Commons BY-NC-SA More information at http://ocw.mit.edu/terms More courses at http://ocw.mit.edu Topics: hydrodynamic limit, classical field theories, Phase transitions, broken symmetries, universality,...
We will learn how elements of perturbation theory can be formulated e_ciently by staying �rmly within the framework of the �eld integral. In doing so, we will see how the �eld integral provides a method for identifying and exploring non-trivial reference ground states � �mean��elds�. A fusion of perturbative and mean��eldmethods will provide us with analytical machinery powerful enough to address a spectrum of rich applications. Topics: Physics, Condensed Matter, Particle Physics and Fields, Quantum Physics, Statistical Physics and... Source: http://www.flooved.com/reader/3045
Fiber Crystal Growth from the Melt Author: Professor Dr. Tsuguo Fukuda, Professor Dr. habil. Peter Rudolph, Professor Dr. Satoshi Uda, Published by Springer Berlin Heidelberg ISBN: 978-3-642-07364-9 DOI: 10.1007/978-3-662-07214-1 Table of Contents: What Do We Want With Fiber Crystals? An Introductory Overview Fundamentals of Growth Dynamics of the μ-Pulling Down Method Theoretical Analysis of the Micro-Pulling-Down Process Practice of Micro Pulling Down Growth Crystal-Chemistry and Fiber... Topics: Physics, Physical organic chemistry, Optical materials, Surfaces (Physics), Physics, Phase...
This course uses the theory and application of atomistic computer simulations to model, understand, and predict the properties of real materials. Specific topics include: energy models from classical potentials to first-principles approaches; density functional theory and the total-energy pseudopotential method; errors and accuracy of quantitative predictions: thermodynamic ensembles, Monte Carlo sampling and molecular dynamics simulations; free energy and phase transitions; fluctuations and... Topics: simulation, computer simulation, atomistic computer simulations, Density-functional theory, DFT,...
In the following, we shall introduce and formulate the MFA for magnetic systems. In the Appendix A, we summarize basic thermodynamic relations for magnetic systems. The results, however, are valid also for other systems. Topics: Physics, Statistical Physics and Thermodynamics, Fundamentals of Classical Statistical Mechanics,... Source: http://www.flooved.com/reader/2957
Material covered in this course includes the following topics: * Laws of thermodynamics: general formulation and applications to mechanical, electromagnetic and electrochemical systems, solutions, and phase diagrams * Computation of phase diagrams * Statistical thermodynamics and relation between microscopic and macroscopic properties, including ensembles, gases, crystal lattices, phase transitions * Applications to phase stability and properties of mixtures * Computational modeling * Interfaces Topics: thermodynamics, mechanical, electromagnetic and electrochemical systems, phase diagrams,...